Eye color in drosophilia is an X-linked trait in which red eye colour is dominant over white eye color. When a white-eyed male drosophila crosses with a red-eyed heterozygous female drosophila, then the type of offspring that would NOT produce are:
Correct answer: C. Red-eyed homozygous females
- A. Red-eyed males
- B. White-eyed males
- C. Red-eyed homozygous females
- D. White-eyed homozygous females
Explanation
Red eye homozygous female is not possible because female will inherit one white eye allele from father. So option C is correct. All other offsprings are possible.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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